@zxing/library
Version:
TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
94 lines (93 loc) • 2.71 kB
JavaScript
/**
* Ponyfill for Java's Integer class.
*/
var Integer = /** @class */ (function () {
function Integer() {
}
Integer.numberOfTrailingZeros = function (i) {
var y;
if (i === 0)
return 32;
var n = 31;
y = i << 16;
if (y !== 0) {
n -= 16;
i = y;
}
y = i << 8;
if (y !== 0) {
n -= 8;
i = y;
}
y = i << 4;
if (y !== 0) {
n -= 4;
i = y;
}
y = i << 2;
if (y !== 0) {
n -= 2;
i = y;
}
return n - ((i << 1) >>> 31);
};
Integer.numberOfLeadingZeros = function (i) {
// HD, Figure 5-6
if (i === 0) {
return 32;
}
var n = 1;
if (i >>> 16 === 0) {
n += 16;
i <<= 16;
}
if (i >>> 24 === 0) {
n += 8;
i <<= 8;
}
if (i >>> 28 === 0) {
n += 4;
i <<= 4;
}
if (i >>> 30 === 0) {
n += 2;
i <<= 2;
}
n -= i >>> 31;
return n;
};
Integer.toHexString = function (i) {
return i.toString(16);
};
Integer.toBinaryString = function (intNumber) {
return String(parseInt(String(intNumber), 2));
};
// Returns the number of one-bits in the two's complement binary representation of the specified int value. This function is sometimes referred to as the population count.
// Returns:
// the number of one-bits in the two's complement binary representation of the specified int value.
Integer.bitCount = function (i) {
// HD, Figure 5-2
i = i - ((i >>> 1) & 0x55555555);
i = (i & 0x33333333) + ((i >>> 2) & 0x33333333);
i = (i + (i >>> 4)) & 0x0f0f0f0f;
i = i + (i >>> 8);
i = i + (i >>> 16);
return i & 0x3f;
};
Integer.truncDivision = function (dividend, divisor) {
return Math.trunc(dividend / divisor);
};
/**
* Converts A string to an integer.
* @param s A string to convert into a number.
* @param radix A value between 2 and 36 that specifies the base of the number in numString. If this argument is not supplied, strings with a prefix of '0x' are considered hexadecimal. All other strings are considered decimal.
*/
Integer.parseInt = function (num, radix) {
if (radix === void 0) { radix = undefined; }
return parseInt(num, radix);
};
Integer.MIN_VALUE_32_BITS = -2147483648;
Integer.MAX_VALUE = Number.MAX_SAFE_INTEGER;
return Integer;
}());
export default Integer;